My wife went on a trip alone - as their relationship grew colder, she became unable to resist the temptations of her younger sister, Yuki... ``Anyway, my sister...she's having an affair while traveling...'' The more she thinks it's no good, the more her rationality is blown away... Evening, night, and morning, while her wife was away, she had intense sex with Yuki and ejaculated over and over again... Her immorality felt too good...